1.9000 - 1.9999 (Non-alloy Quality Steels)
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1.9000 - 1.9099 (Base Steels)
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1.9300 - 1.9399 (Steels with Average C < 0,12% or Rm < 400 MPa)
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1.9400 - 1.9499 (Steels with Average 0,12% =< C < 0,25% or 400 MPa = < Rm < 500 MPa)
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1.9500 - 1.9599 (Steels with Average 0,25% =< C < 0,55% or 500 MPa =< Rm < 700 MPa)
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1.9600 - 1.9699 (Steels with Average C >= 0,55% or Rm >= 700 MPa)
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1.9700 - 1.9799 (Steels with Higher P or S Content)